 |
|||
|
|
|||
|
|
|||
| ||||||||||
|
|
 NAVAIR 17-15-50.3
TM 38-301-3
T.O. 33-1-37-3
CGTO 33-1-37-3
ENGINE:
J75-P-13/-17/-19
AIRCRAFT:
(U-2)
JOAP ATOMIC EMISSION ROTRODE
Fe
Ag
Al
Cr
Cu
Mg
Ti
Abnormal Trend
(PPM Increase
9
2
3
2
3
4
2
in 10 hrs)
Normal Range
0-30
0-3
0-8
0-4
0-6
0-12
0-2
Marginal Range
31-37
N/A
9
5
7
13-15
3
High Range
38-44
4
10-11
6
8-9
16-17
4
Abnormal
45+
5+
12+
7+
10+
18+
5+
Average Concentration Other Elements:
Ni=1
Pb=3
Si=6
Sn=9
Mo=1
High Fe or Fe in combination with Cu usually indicates bearing trouble, particularly Nos. 3, 4, or 5 bearings.
Increase in Mg which may be accompanied with increase in Fe indicate possible discrepancy due to fretting of the
bearing liner in the main gearbox. High Al and Fe may indicate defective oil pump. Ti is a significant wear metal.
Increases in Ti are indicative of the spacer between Nos. 2, 2-1/2 and 3 bearing turning on the shaft. High Fe
together with high Ti indicate discrepancy in the Nos. 2, 2-1/2 and No. 3 bearing area.
NOTE
High Al by itself may be indicative of worn threaded area on oil tank breather tee fitting
and is due to movement of fitting.
Fe
Main bearing balls/rollers, races, seals and housing
Front accessory drive gears
Main accessory drive gears and housing
Main gearbox gears
Fe
Al
Front accessory drive oil pump
Main gearbox oil pump
Fe
Ag
No. 3 bearing cages
Main accessory drive bearings
Fe
Ag
Cu
&
Main gearbox bearings
Si
Sn
Ag
Cu
&
Nos. 1, 2, 2-1/2, 4, 4-1/2, 5 and 6 bearings cages
Si
Sn
Mg
Front accessory drive and main gearbox housing
Ti
No. 2 hub shaft between Nos. 2, 2-1/2, and 3 main bearing.
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals